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NE20E GRE tunnel cannot up

Publication Date:  2018-03-30 Views:  61 Downloads:  0
Issue Description

GRE tunnel cannot up on NE20E router, the GRE source and destination can reach each other. GRE tunnel use loopback 0 of the deivce as the tunnel source. There is no security device beween the two NE20E. After configure GRE tunnel, the physical and protocol state are always down.



Alarm Information

Tunnel0/1/0                       12.1.1.2/24     down       down     --  


Handling Process

1. Checking the GRE configuration on the both side and the configuration is right.

#

interface LoopBack0

 ip address 30.1.1.1 255.255.255.255

 binding tunnel gre

#

#

interface Tunnel 0/1/0

 ip address 12.1.1.2 255.255.255.252

 tunnel-protocol gre

 source 30.1.1.1

 destination 20.1.1.1

#

2. Check the reachability between the GRE source and destination, They can reach each other.

Root Cause

For the NE box device, the number of the tunnel must be one-dimensional. For the chassis NE router, the number should be three-dimensional.

Solution

Change the number of the GRE tunnel to one-dimensional on both side and the issue resolved.

#

interface Tunnel 1

 ip address 12.1.1.2 255.255.255.252

 tunnel-protocol gre

 source 30.1.1.1

 destination 20.1.1.1

#

END